Offside error after formatting with MultiLineLambdaClosingNewline

[Smaug123]

Issue created from fantomas-online

Code

module Foo =

    let bar () =
        []
        |> Seq.iter(fun (a, b) ->
            let blah =
                fieldInfos
                |> Seq.groupBy (fun fi -> fi.Name)
                |> Seq.filter (fst >> foo >> not)
                |> Seq.choose (fun (name, fieldInfos) ->
                    let fieldTypes = fieldInfos |> Seq.map (fun fi -> TypeId fi.TypeInfo.Id) |> Seq.distinct |> Seq.toList
                    match fieldTypes with
                    | [ fieldType ] -> // hi!
                        let parents = fieldInfos |> Seq.cache
                        Some (name, fieldType, parents)
                    | _ -> // differing
                        None
                )
            ()
        )

Result

module Foo =

    let bar () =
        []
        |> Seq.iter (fun (a, b) -> let blah =
                fieldInfos
                |> Seq.groupBy (fun fi -> fi.Name)
                |> Seq.filter (fst >> foo >> not)
                |> Seq.choose (fun (name, fieldInfos) -> let fieldTypes =
                        fieldInfos
                        |> Seq.map (fun fi -> TypeId fi.TypeInfo.Id)
                        |> Seq.distinct
                        |> Seq.toList

                    match fieldTypes with
                    | [ fieldType ] -> // hi!
                        let parents = fieldInfos |> Seq.cache
                        Some(name, fieldType, parents)
                    | _ -> // differing
                        None
                )

            ()
        )

Problem description

This has a bunch of offside errors due to the let migrating up one line. The error arises when enabling MultiLineLambdaClosingNewline, but not otherwise.

Extra information

• [/] The formatted result breaks by code.
• The formatted result gives compiler warnings.
• I or my company would be willing to help fix this.

Options

Fantomas Master at 05/21/2021 11:35:53 - acd47bd

    { config with
                MultiLineLambdaClosingNewline = true
                KeepIndentInBranch = true }

_{Did you know that you can ignore files when formatting from fantomas-tool or the FAKE targets by using a .fantomasignore file?}